/**
 * libpsd - Photoshop file formats (*.psd) decode library
 * Copyright (C) 2004-2007 Graphest Software.
 *
 * libpsd is the legal property of its developers, whose names are too numerous
 * to list here.  Please refer to the COPYRIGHT file distributed with this
 * source distribution.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Library General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * $Id: pattern_overlay.c, created by Patrick in 2006.06.18, libpsd@graphest.com Exp $
 */

#include <math.h>
#include "libpsd.h"
#include "psd_config.h"
#include "psd_system.h"
#include "psd_stream.h"
#include "psd_color.h"
#include "psd_rect.h"
#include "psd_bitmap.h"
#include "psd_descriptor.h"


extern psd_status psd_pattern_fill(psd_bitmap * dst_bmp, psd_pattern * pattern, psd_int scale, psd_int offset_x, psd_int offset_y);


psd_static void psd_set_layer_pattern_overlay_default(psd_layer_effects_pattern_overlay * pattern_overlay)
{
    pattern_overlay->blend_mode = psd_blend_mode_normal;
    pattern_overlay->opacity = 255;
    pattern_overlay->scale = 100;
    pattern_overlay->link_with_layer = psd_true;
}

psd_status psd_get_layer_pattern_overlay2(psd_context * context, psd_layer_effects_pattern_overlay * pattern_overlay)
{
    psd_int length, number_items;
    psd_uint rootkey, type, key;
    psd_uchar keychar[256];
    
    psd_set_layer_pattern_overlay_default(pattern_overlay);

    // Unicode string: name from classID
    length = psd_stream_get_int(context) * 2;
    psd_stream_get_null(context, length);

    // classID: 4 bytes (length), followed either by string or (if length is zero) 4-
    // byte classID
    length = psd_stream_get_int(context);
    if(length == 0)
        psd_stream_get_int(context);
    else
        psd_stream_get_null(context, length);

    // Number of items in descriptor
    number_items = psd_stream_get_int(context);

    while(number_items --)
    {
        length = psd_stream_get_int(context);
        if(length == 0)
            rootkey = psd_stream_get_int(context);
        else
        {
            rootkey = 0;
            psd_stream_get(context, keychar, length);
            keychar[length] = 0;
        }
        // Type: OSType key
        type = psd_stream_get_int(context);

        switch(rootkey)
        {
            case 0:
                if(strcmp(keychar, "phase") == 0)
                {
                    psd_assert(type == 'Objc');
                    psd_stream_get_object_point(&pattern_overlay->horz_phase, 
                        &pattern_overlay->vert_phase, context);
                    // problem, why ???
                    pattern_overlay->horz_phase = 0;
                    pattern_overlay->vert_phase = 0;
                }
                else
                {
                    psd_assert(0);
                    psd_stream_get_object_null(type, context);
                }
                break;
                
            // effect enable
            case 'enab':
                psd_assert(type == 'bool');
                pattern_overlay->effect_enable = psd_stream_get_bool(context);
                break;

            // blend mode
            case 'Md  ':
                psd_assert(type == 'enum');
                
                // TypeID: 4 bytes (length), followed either by string or (if length is zero) 4-
                // byte typeID
                length = psd_stream_get_int(context);
                psd_assert(length == 0);
                key = psd_stream_get_int(context);
                // Gradient Type
                psd_assert(key == 'BlnM');
                pattern_overlay->blend_mode = psd_stream_get_object_blend_mode(context);
                break;

            // opacity
            case 'Opct':
                psd_assert(type == 'UntF');
                // percent
                key = psd_stream_get_int(context);
                psd_assert(key == '#Prc');
                // Actual value (double)
                pattern_overlay->opacity = (psd_int)(psd_stream_get_double(context) * 2.55 + 0.5);
                break;

            // pattern
            case 'Ptrn':
                psd_assert(type == 'Objc');
                psd_stream_get_object_pattern_info(&pattern_overlay->pattern_info, context);
                break;

            // scale
            case 'Scl ':
                psd_assert(type == 'UntF');
                // percent
                key = psd_stream_get_int(context);
                psd_assert(key == '#Prc');
                // Actual value (double)
                pattern_overlay->scale = (psd_int)psd_stream_get_double(context);
                break;

            // link with layer
            case 'Algn':
                psd_assert(type == 'bool');
                pattern_overlay->link_with_layer = psd_stream_get_bool(context);
                break;

            default:
                psd_assert(0);
                psd_stream_get_object_null(type, context);
                break;
        }
    }
    
    return psd_status_done;
}

#ifdef PSD_SUPPORT_EFFECTS_BLEND
psd_status psd_layer_effects_blend_pattern_overlay(psd_context * context, psd_layer_record * layer, psd_layer_effects * data)
{
    psd_layer_effects_pattern_overlay * pattern_overlay = &data->pattern_overlay;
    psd_bitmap src_bmp, dst_bmp;
    psd_layer_mask_info layer_mask_info;
    psd_int i;

    data->left[psd_layer_effects_type_pattern_overlay] = 0;
    data->top[psd_layer_effects_type_pattern_overlay] = 0;
    data->right[psd_layer_effects_type_pattern_overlay] = layer->width;
    data->bottom[psd_layer_effects_type_pattern_overlay] = layer->height;
    data->blend_mode[psd_layer_effects_type_pattern_overlay] = pattern_overlay->blend_mode;
    data->opacity[psd_layer_effects_type_pattern_overlay] = pattern_overlay->opacity;
    data->width[psd_layer_effects_type_pattern_overlay] = layer->width;
    data->height[psd_layer_effects_type_pattern_overlay] = layer->height;

    if(data->image_data[psd_layer_effects_type_pattern_overlay] == NULL)
    {
        data->image_data[psd_layer_effects_type_pattern_overlay] = (psd_argb_color *)psd_malloc(layer->width * layer->height * 4);
        if(data->image_data[psd_layer_effects_type_pattern_overlay] == NULL)
            return psd_status_malloc_failed;
    }

    src_bmp.width = layer->width;
    src_bmp.height = layer->height;
    src_bmp.image_data = layer->image_data;
    dst_bmp.width = layer->width;
    dst_bmp.height = layer->height;
    dst_bmp.image_data = data->image_data[psd_layer_effects_type_pattern_overlay];

    for(i = 0; i < context->pattern_count; i ++)
    {
        if(strcmp(context->patterns[i].unique_id, pattern_overlay->pattern_info.identifier) == 0)
        {
            psd_pattern_fill(&dst_bmp, &context->patterns[i], pattern_overlay->scale, 
                pattern_overlay->horz_phase, pattern_overlay->vert_phase);
            break;
        }
    }
    
    psd_bitmap_mix_alpha_channel(&dst_bmp, &src_bmp);
    memcpy(&layer_mask_info, &layer->layer_mask_info, sizeof(psd_layer_mask_info));
    if(layer_mask_info.disabled == psd_false && (layer_mask_info.default_color != 255 || layer_mask_info.mask_data != NULL))
    {
        layer_mask_info.left -= layer->left;
        layer_mask_info.top -= layer->top;
        layer_mask_info.right -= layer->left;
        layer_mask_info.bottom -= layer->top;
        psd_bitmap_blend_mask(&dst_bmp, &layer_mask_info);
    }

    data->valid[psd_layer_effects_type_pattern_overlay] = psd_false;
    
    return psd_status_done;
}
#endif

